Alarm detector responsive to rate change of a monitored conditio

Details Alarm detector responsive to rate change of a monitored conditio Alarm detector responsive to rate change of a monitored conditio

1979-06-27

1981-11-10

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

73355R, 250349, G01J 100

Patent

active

043000487

ABSTRACT:
A physical quantity such as temperature, infrared radiation or smoke is detected by means of a conversion device for emitting an alarm signal whose amplitude is representative of the intensity of the physical quantity. The detector comprises a unit for measuring relative variations of the signal in time, for comparing them with a preset threshold level and for actuating the alarm when they exceed the threshold level.

REFERENCES:
patent: 3619614 (1971-11-01), Yamaka
Sze, "Physics of Semiconductor Devices", Bell Telephone Labs, John Wiley & Sons, 1969, pp. 659-663.

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